package com.atguigu.educenter.controller;
import com.atguigu.commonutils.JwtUtils;
import com.atguigu.educenter.Utils.ConstantWxUtils;
import com.atguigu.educenter.Utils.HttpClientUtils;
import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.google.gson.Gson;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;


import java.io.UnsupportedEncodingException;

import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @author 25169
 */
@Controller
@RequestMapping("/api/ucenter/wx")
public class WxApiController {
    private static final Logger logger = LoggerFactory.getLogger(WxApiController.class);

    @Autowired
    private UcenterMemberService memberService;
    @GetMapping("callback")
    public String callback(String code,String state){

        String tokenInfo=null;
        try {
            //获取code值，临时票据，类似于验证码

            //拿着code请求微信固定的地址，得到两个值 access_token 和openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接参数
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code);
            //请求拼接好的地址，得到access_token 和openid。
            // 使用httpclient发送请求，得到结果
            tokenInfo= HttpClientUtils.get(accessTokenUrl);
            logger.info("tokenInfo为:{}",tokenInfo);
        } catch (Exception e) {
            e.printStackTrace();
        }

        //解析json字符串
        Gson gson = new Gson();
        HashMap map = gson.fromJson(tokenInfo, HashMap.class);
        String accessToken = (String)map.get("access_token");
        String openid = (String)map.get("openid");
        //查询数据库当前用用户是否曾经使用过微信登录
        UcenterMember member = memberService.getByOpenid(openid);
        logger.info("member为:{}",member);
        if(member == null){
            logger.info("新用户注册");
            //访问微信的资源服务器，获取用户信息
            String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                    "?access_token=%s" +
                    "&openid=%s";
            String userInfoUrl = String.format(
                    baseUserInfoUrl,
                    accessToken,
                    openid);
            String resultUserInfo = null;
            try {
                resultUserInfo = HttpClientUtils.get(userInfoUrl);
                logger.info("resultUserInfo=========={}",resultUserInfo);
            } catch (Exception e) {
                throw new GuliException(20001, "获取用户信息失败");
            }

            //解析json
            HashMap<String, Object> mapUserInfo = gson.fromJson(resultUserInfo, HashMap.class);
            String nickname = (String)mapUserInfo.get("nickname");
            String headimgurl = (String)mapUserInfo.get("headimgurl");

            //向数据库中插入一条记录
            member = new UcenterMember();
            member.setNickname(nickname);
            member.setOpenid(openid);
            member.setAvatar(headimgurl);

            memberService.save(member);
        }
        //TODO 登录
        String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
        return "redirect:http://localhost:3000?token="+jwtToken;
    }

    /**
     * 生成二维码
     * @return
     */
    @GetMapping("login")
    public String getWxCode(){
        // 微信开放平台授权baseUrl
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";
        // 回调地址
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL; //获取业务服务器重定向地址
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "UTF-8"); //url编码
        } catch (UnsupportedEncodingException e) {
            throw new GuliException(20001, e.getMessage());
        }
        // 防止csrf攻击（跨站请求伪造攻击）
        //String state = UUID.randomUUID().toString().replaceAll("-", "");//一般情况下会使用一个随机数
        String state = "imhelen";//为了让大家能够使用我搭建的外网的微信回调跳转服务器，这里填写你在ngrok的前置域名
        System.out.println("state = " + state);
        // 采用redis等进行缓存state 使用sessionId为key 30分钟后过期，可配置
        //键："wechar-open-state-" + httpServletRequest.getSession().getId()
        //值：satte
        //过期时间：30分钟

        //生成qrcodeUrl
        String qrcodeUrl = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                state);
        return "redirect:" + qrcodeUrl;
    }
}
